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“Identity-Based” Filtering
For most people, 90–99% of their legitimate email comes from people or entities they know
- Notable exceptions: help desks, inquiry addresses, “info@” addresses, etc.
- Allow (white) lists can reduce false positives
- I’ll accept mail from my mother, my boss, or my bank without scanning
Also, 90–99% of their spam comes from people or entities they do not know
- Notable exception: on-line order acknowledgments
Critical: must ensure sender is who they claim to be
- ... not someone pretending to be my bank
- Phishing usually involves identity theft
- Authentication required